Increased expression of poly(ADP-ribose) polymerase-1 contributes to caspase-independent myocyte cell death during heart failure

American Journal of Physiology. Heart and Circulatory Physiology
Jyothish B PillaiMahesh P Gupta

Abstract

Poly(ADP-ribose) polymerase-1 (PARP-1) plays a pivotal role in regulating genome stability, cell cycle progression, and cell survival. However, overactivation of PARP has been shown to contribute to cell death and organ failure in various stress-related disease conditions. In this study, we examined the role of PARP in the development and progression of cardiac hypertrophy. We measured the expression of PARP in mouse hearts with physiological (swimming exercise) and pathological (aortic banding) cardiac hypertrophy as well as in human heart samples taken at the time of transplantation. PARP levels were elevated both in swimming and banded mice hearts and demonstrated a linear positive correlation with the degree of cardiac hypertrophy. A dramatic increase (4-fold) of PARP occurred in 6-wk banded mice, accompanied by apparent signs of ventricular dilation and myocyte cell death. PARP levels were also elevated (2- to 3-fold) in human hearts with end-stage heart failure compared with controls. However, we found no evidence of caspase-mediated PARP cleavage in either mouse or human failing hearts. Overexpression of PARP in primary cultures of cardiac myocytes led to suppression of gene expression and robust myocyte cell death. Furt...Continue Reading

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